GLCOLORATTACHMENT15

GL_COLOR_ATTACHMENT15 is an OpenGL enumeration that designates the 16th color attachment point of a framebuffer object (FBO). Color attachments serve as render targets for the color outputs of a fragment shader, and a framebuffer can contain multiple color attachments. GL_COLOR_ATTACHMENT15 is used to refer specifically to the 16th attachment and is valid when the implementation supports at least 16 color attachments.

Usage: You attach a texture or renderbuffer to this attachment by using functions such as glFramebufferTexture2D or glFramebufferTexture (for textures) and glFramebufferRenderbuffer (for renderbuffers) with the attachment parameter set to GL_COLOR_ATTACHMENT15. It is also used with glDrawBuffers to select which color buffers are active for rendering; a typical setup lists GL_COLOR_ATTACHMENT0 through GL_COLOR_ATTACHMENT15 and passes them to glDrawBuffers. In GLSL, fragment shader outputs map to these attachments according to the location or draw buffer configuration.

Limits and compatibility: The use of GL_COLOR_ATTACHMENT15 requires GL_MAX_COLOR_ATTACHMENTS to be at least 16. The enumerants GL_COLOR_ATTACHMENT0 through GL_COLOR_ATTACHMENT15 originate in the GL_ARB_draw_buffers extension and are present in core OpenGL in later versions.

Value: The constant GL_COLOR_ATTACHMENT15 has the numeric value 0x843F.

See also: GL_COLOR_ATTACHMENT0–GL_COLOR_ATTACHMENT14, GL_MAX_COLOR_ATTACHMENTS, GL_DRAW_BUFFERS, GL_FRAMEBUFFER, glFramebufferTexture2D, glFramebufferTexture, glFramebufferRenderbuffer, and GLSL fragment outputs.